Dezzar, Pyro-Frost Assassin

All elementals you control have "Whenever
another elemental you control enters the
battlefield choose one —
• Copy that creature once
• Create a 4/4 red and blue elemental token
creature"
{4}{u}{r}, {t}, Sacrifice four elemental creatures
you control: Create two Frostfire, a legendary
6/6 blue and red elemental token creature with
flying and haste.